CDL hub
CDL Practice Tests and State Requirements (2026)
A Commercial Driver’s License (CDL) is required to drive many large trucks, buses, combination vehicles, and vehicles carrying placarded hazardous materials. Before you can get a CDL, you usually need a commercial learner’s permit, one or more written knowledge tests, and a skills test through your state licensing agency.
This free CDL hub helps applicants understand the starting path, compare CDL classes, review common endorsements, and find state-specific requirement pages. Use it as a planning guide, then verify final requirements with FMCSA and your state DMV or driver licensing agency before scheduling tests.
Start here
Learn the CDL basics first
What Is a CDL?
Learn what a Commercial Driver’s License is, who needs one, and what types of commercial vehicles each class covers.
CDL Classes Explained
Compare Class A, Class B, and Class C licenses so you can match your CDL path to the vehicle or driving job you want.
How to Get Your CDL
Follow the process from commercial learner’s permit to written tests, training, skills testing, and state licensing steps.
Practice tests
CDL General Knowledge Practice Test
The general knowledge test is the common starting point for CDL applicants. Practice questions covering safe driving, vehicle inspection, cargo basics, road rules, and commercial driving situations.
Focused CDL test
CDL Air Brakes Practice Test
Study system components, pressure gauges, low-air warnings, leakage checks, spring brakes, stopping distance, ABS, and downgrade braking with immediate explanations.
Class A focused test
CDL Combination Vehicles Practice Test
Practice coupling, fifth-wheel inspection, trailer air lines, tractor protection systems, safe turns, backing, rollover prevention, and brake checks with immediate explanations.
Hazardous materials endorsement
CDL HazMat Practice Test
Practice hazard classes, shipping papers, labels, placards, loading and segregation, safe driving, security, and emergency response with 198 original question variants.
Tank vehicle endorsement
CDL Tanker Practice Test
Practice N endorsement definitions, inspections, outage, liquid surge, tank design, loading, and safe tanker operation with 174 original question variants.
Double/triple trailer endorsement
CDL Doubles/Triples Practice Test
Practice crack-the-whip control, converter dollies, coupling order, shut-off valves, inspection points, and multi-trailer air-brake checks with 174 original question variants.
Passenger endorsement
CDL Passenger Endorsement Practice Test
Practice passenger-vehicle inspections, boarding and unloading, baggage, railroad crossings, drawbridges, emergency procedures, and safe bus operation with 204 original question variants.
School Bus endorsement
CDL School Bus Endorsement Practice Test
Practice danger zones, mirrors, student loading and unloading, railroad crossings, emergency evacuation, student management, and safe school bus operation with 228 original question variants.
CDL skills test
CDL Pre-Trip Inspection Practice Test
Practice the component knowledge behind the CDL Vehicle Inspection Test with 252 questions covering cab controls, engine systems, steering, suspension, brakes, tires, lights, coupling, trailers, cargo, and buses.
CDL skills test
CDL Basic Control Skills Practice Test
Compare current and modernized maneuver sets, then practice scoring terms, range safety, mirror use, straight backing, offset control, parking, alley docking, and test-day decisions with 216 question variants.
CDL skills test
CDL Road Test Practice Test
Practice turns, intersections, lane changes, highway driving, speed and spacing, railroad crossings, clearances, observation, and test-day judgment with 216 question variants.
Endorsements
CDL endorsement topics to plan for
Many CDL applicants need more than the general knowledge test. These endorsement areas often require extra knowledge tests, restrictions, background checks, or skills checks depending on the vehicle and cargo.
CDL by state
CDL Requirements by State
Every state sets its own CDL fees, test locations, appointment steps, age rules, medical-document handling, and licensing office process. Start with your state page, then verify final details with your official state licensing agency.
CDL questions
Common CDL questions
The timeline depends on your state, training path, commercial learner permit holding period, test scheduling, and endorsements. Many applicants need several weeks or months.
It depends on the GVWR or GCWR, passenger use, and whether hazardous materials are carried. Some box trucks do not need a CDL, while larger or placarded vehicles may.
Class A generally covers qualifying combination vehicles. Class B generally covers qualifying single heavy vehicles such as many straight trucks and buses.
Yes. Hazmat, tanker, passenger, school bus, doubles/triples, and air-brake-related requirements can add extra testing or restrictions.
Official sources
CDL sources to verify before testing
US Permit Prep is an independent study site and is not affiliated with FMCSA, any DMV, or any state licensing agency. CDL rules can change, so use these official pages to verify final requirements.
Motorcycle license
Getting a motorcycle instead?
If your next goal is riding, start with the Motorcycle Permit Guide for permit basics, state requirement pages, and future motorcycle practice tools.
See our Motorcycle Permit Guide →Car permit planning
Need regular car permit cheat sheets instead?
If you are preparing for a standard learner permit, use the DMV Cheat Sheets for what to bring, required documents, fees, road signs, written-test topics, and permit restrictions.
See DMV Cheat Sheets →